Introduction

Cluster Nodes are Universal Controller instances in a Universal Automation Center system.

Universal Automation Center contains more than one cluster node only if it is operating in a High Availability environment.

Displaying Information About Cluster Nodes

When you start a cluster node for the first time, the Controller automatically creates a database record for that cluster node. You can view these records for details and status information.

Step 1	From the Agents & Connections navigation pane, select System > Cluster Nodes. The Cluster Nodes list displays:
Step 2	To display the Details for a cluster node on the list, click the Details icon next to the Node Id, or click anywhere in the row.

Cluster Node Details

For information on how to access additional details - such as Metadata and complete database Details - for Cluster Nodes (or any type of record), see Records.

Cluster Node Details Field Descriptions

The following table describes the fields on the Cluster Nodes Details

Field Name	Description
Details	This section contains detailed information about the cluster node.
Node ID	hostname:port-database_name of the cluster node.
Mode	Current mode of the cluster node: Active: Cluster node processes events and messages and interfaces with the database. It is the active node for automated operations.\\ Passive: Cluster node is running but is not connected to its OMS Server. It performs the following tasks: Accepts HTTP requests for data. It can access the database, generate reports, monitor and display data. Does not process any events or messages. Takes over as Active node if it determines that the Active node is not running. Offline: Cluster node is not running. (See Passive Cluster Node Restrictions for further information on Passive cluster node capabilities.)
Host Name	User-provided during installation; IP address or domain/name of the host machine where the resource resides.
Release	System-supplied; release number for this node. Support purposes only.
IP Address	System-supplied; IP address of this node.
Build ID	System-supplied; build ID for this node. Support purposes only.
Start Time	System-supplied; date and time this node was last started.
Build Date	System-supplied; build date for this node. Support purposes only.
Timestamp	System-supplied; date and time of this node's last heartbeat.
Uptime	System-supplied; amount of time this node has been running.
Paused	Indication that this node has been paused.
Preferred	Indication that this node is set as Preferred.
Transient	Indication that this node is set as Transient.
Metadata	This section contains Metadata information about this record.
UUID	Universally Unique Identifier of this record.
Updated By	Name of the user that last updated this record.
Updated	Date and time that this record was last updated.
Created By	Name of the user that created this record.
Created	Date and time that this record was created.
Buttons	This section identifies the buttons displayed above and below the Cluster Node Details that let you perform various actions.
Refresh	Refreshes any dynamic data displayed in the Details.
Tabs	This section identifies the tabs across the top of the Cluster Node Details that provide access to additional information about the cluster node.
Cluster Notifications	Lists all notifications that have been defined for this cluster node.

Starting/Stopping Cluster Nodes

For instructions on starting and stopping cluster nodes, see Starting and Stopping Universal Controller.

Sending Notifications on Status of a Cluster Node

You can configure Cluster Nodes to send a notification via email or SNMP when the resource goes Offline or becomes Active.

Step 1	From the Agents and Connections navigation pane, select System > Cluster Nodes. The Cluster Nodes list displays.
Step 2	Click the Details icon next to the Node ID of a Cluster Node, or click anywhere in the Cluster Node row, to display Details about the Cluster Node.
Step 3	Click the Cluster Notifications tab to display a list of any Email and SNMP notifications configured for the Cluster Node.
Step 4	Select the type of notification you want the Cluster Node to send, and then click New. Notification Details for a new Notification displays (see Email Notification Details and SNMP Notification Details, below).
Step 5	Complete the fields as needed (see Email Notification Details Field Descriptions and SNMP Notification Details Field Descriptions, below). Note Cluster Node built-in variables are available to pass data about the Cluster Node into the notification. (User-defined variables, including Global variables, are not available for use in Cluster Node email notifications).
Step 6	Click a Save button to save the record.

Email Notification Details

Email Notification Details Field Descriptions

The following table describes the fields and buttons on Email Notification Details.

Field Name	Description
Criteria	This section contains criteria for sending the notification.
Mode	Options: Offline = Trigger the notification when the cluster node goes offline. Active = Trigger the notification when the cluster node becomes active. Passive = Trigger the notification when the cluster node becomes passive.
Details	This section contains assorted detailed information about the notification.
Email Template	Name of an Email template defined in an Email Template Details. An Email template allows you to specify standard recipients and text for outgoing emails. Enter the name of an existing Email template, select an Email template from the drop-down list, or click the Details icon to create a new Email template. Every Email template specifies an Email connection. If you do not specify an Email template in this field, you must specify an Email connection in the Email Connection field. If you specify both an Email template (in this field) and an Email Connection, the Email server specified in the Email Connection field overrides the Email server specified in this field. (Any information specified in an Email task overrides what is specified in an Email template.)
Email Connection	Required if an Email Template is not specified in the Email Template field; Name of an outgoing Email Connection (Type = Outgoing). An Email Connection specifies information about an outgoing or incoming email server. Enter the name of an existing outgoing Email Connection, select an existing outgoing Email Connection from the drop-down list, or clear the Email Connection field and click the Details icon to create a new Email Connection (Outgoing will be pre-selected in the Type field). If you specify both an Email Template and an Email Connection (in this field), the Email Connection specified in this field overrides the Email Connection specified in the Email Template field.
Reply-To	Email address of the sender. Use commas to separate multiple recipients. Variables and functions supported.
To	Email address of the recipient. Use commas to separate multiple recipients. Variables and functions supported.
CC	Email address of the party being sent a copy of the email, if any. Use commas to separate multiple recipients. Variables and functions supported.
BCC	Email address of the party being sent a blind (hidden) copy of the email, if any. Use commas to separate multiple recipients. Variables and functions supported.
Subject	Subject line of the email. Variables and functions supported.
Body	Text of the email message. Variables and functions supported. Note If both the Email Template and the Email Task (or Email Notification) contain text in the Body, the text in the Email Template is appended to the text in the Email Task (or Email Notification).
Buttons	This section identifies the buttons displayed above and below the Notification Details that let you perform various actions.
Save	Submits the new record to the database.
Save & New	Saves a new record in the Controller database and redisplays empty Details so that you can create another new record.
Save & View	Saves a new record in the Controller database and continues to display that record.
Update	Saves updates to the record.
Delete	Deletes the current record.
Refresh	Refreshes any dynamic data displayed in the Details.
Close	For pop-up view only; closes the pop-up view of this notification.

SNMP Notification Details

SNMP Notification Details Field Descriptions

The following table describes the fields and buttons on SNMP Notification Details.

Field Name	Description
Criteria	This section contains criteria for sending the notification.
Mode	Options: Offline = Trigger the notification when the cluster node goes offline. Active = Trigger the notification when the cluster node becomes active. Passive = Trigger the notification when the cluster node becomes passive.
Details	This section contains assorted detailed information about the notification.
SNMP Manager	The SNMP Manager that will receive the SNMP notification. Enter the name of an existing SNMP Manager, select an existing SNMP Manager from the drop-down list, or clear the SNMP Manager field and click the Details icon to create a new SNMP Manager.
Notification Severity	Severity of this notification. Options: Normal (1) Warning (2) Minor (3) Major (4) Critical (5)
Buttons	This section identifies the buttons displayed above and below the Notification Details that let you perform various actions.
Save	Submits the new record to the database.
Save & New	Saves a new record in the Controller database and redisplays empty Details so that you can create another new record.
Save & View	Saves a new record in the Controller database and continues to display that record.
Update	Saves updates to the record.
Delete	Deletes the current record.
Refresh	Refreshes any dynamic data displayed in the Details.
Close	For pop-up view only; closes the pop-up view of this notification.

Designating a Cluster Node as Preferred

You can designate a particular Cluster Node as preferred so that it will always be the Active node if it is running.

In a clustered environment, there may be one node in the cluster that you want to always be the Active node. Designating one node in the cluster as Preferred will cause that node to always assume the role of the Active node when it is running.

Step 1	From the Services navigation pane, select System > Cluster Nodes to display the Cluster Nodes list.
Step 2	Locate the Cluster Node you want to designate as Preferred.
Step 3	Right-click the Cluster Node Name on the list or right-click on the Cluster Node Details to access the Action Menu.
Step 4	Click Set Node Preferred.

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